Why Are Schools Limiting Screen Time?

This school year, the Los Angeles Unified School District (LAUSD) and several neighboring school districts are introducing stricter age-based limits on classroom screen time. The new policy comes after parents and educators have long expressed concern over children’s growing reliance on technology for both learning and leisure.

Under the new guidance, students in early education and kindergarten through first grade will have no weekly classroom screen time. Students in grades 2 and 3 will be limited to 1 hour and 40 minutes per week, with those in grades 4 and 5 limited to 2 1/2 hours, students in grades 6 through 8 limited to 6 hours per week, and high school students limited to 10 hours per week.

The limits include time spent on screen-based homework.

“Screen time is literally changing the trajectory of brain development. It’s growing the visual cortex at the expense of the areas responsible for language, reading and social skills,” said Jane Tavyev Asher, MD, pediatric neurologist and director of the Division of Pediatric Neurology at Cedars-Sinai Guerin Children’s. “Parents should actually be very delighted that their kids are going to have less screen time in the school setting, and they should view the school as working as their partner in helping with their child’s brain development.”

As the new policy takes effect this school year, the Cedars-Sinai Newsroom spoke with Tavyev Asher about why reducing screen time can benefit children’s brain development—and how parents can reinforce healthy screen habits at home.

Why were these new screen time policies needed?

Research continues to show that excessive screen time can affect how children’s brains grow and develop. During childhood, the brain is building important skills for language, reading, attention and social interaction. We want the brain to develop for reading, language and social skills. And screen time is really growing the visual cortex at the expense of all of the other parts of the brain.

Sharply reducing screen time at school can help create more opportunities for students to have active learning, conversation and deeper cognitive development in the long run.

Now that schools are seeing the neuroscience behind what screen time does to the developing brain, many are beginning to embrace this research and implement limits. They want what’s best for students’ brain development, just as parents do. At the end of the day, we’re all working toward the same goal: helping our children learn, grow and thrive.

Why is limiting screen time especially important during early childhood?

Early childhood is a critical period for learning to speak, read, write and develop social skills. During these years, the brain’s auditory and language centers are rapidly developing through conversation and human interaction.

For example, speech development begins around age 1, when children start learning how to speak. This process depends on the development of nerve signals and the continued growth of the auditory cortex, which develops significantly during the first few years of life. The auditory cortex is also the part that builds not just language but also social interaction.

Excessive screen use may interfere with these processes by overstimulating visual pathways while reducing opportunities for face-to-face communication, language development and recognizing social cues such as facial expressions and body language.

How can screen use affect brain development in middle schoolers?

Higher-level cognitive functions really begin to take off around age 12. This is when intellectual curiosity starts to develop. It’s a stage where children naturally begin making connections between ideas, such as reading one thing, connecting it to something else they’ve learned, asking questions, and wanting to find the answers. That’s exactly how we want their brains to develop.

But if everything is fed to them passively through AI or excessive screen-based learning, that part of the brain isn’t being exercised in the same way. They’re consuming information rather than actively thinking, questioning and making connections. It’s wonderful that our schools are finally coming to this realization and changing the way the curriculum is given to our children.

What screen time advice do you have for parents of high schoolers?

For a high schooler, I would try to keep the same guidelines in the home that you’ve done for the younger children. The reason for that is they still have that developing brain, and screen time is still very addictive.

I think at this age, they really do have the understanding as to why screens are not ideal for them. By the time they’re in high school, teenagers can understand the logic behind reducing screen time. This is the time when their intellect is developing. They can read the studies about it. As parents, this is also an ideal time to expose them to the studies that are showing what screen time addiction is doing to the brain in the long run.

How should parents approach smartphones for middle and high school students?

The smartphone is really the worst form of screen time because it is so easily accessible in the pocket. It’s easier to become addicted to that. So, it’s important to monitor how children access and use their smartphones.

There is so much social growth that happens in middle school. If you can just get the kids over that hump without a phone, then you can keep them from getting addicted to that phone.

There’s a program called “Wait Until 8th.” It’s a movement where parents sign a pledge to delay giving their child a smartphone until at least the end of eighth grade or until they’re 13 years old. When families make this commitment together, it creates a community where fewer kids have smartphones early on, which helps reduce the peer pressure to get one before they’re ready. It gives parents support in setting healthy boundaries and makes it easier for children to wait alongside their friends.

If you need to be in touch with your teenager, give them a simple flip phone that has no internet access. This way, they can call who they need to call. In some phones, you can also program who they call or receive calls from.

How can parents set and enforce screen time limits at home?

Parents have a huge influence on how children develop their relationship with screens. It’s much easier to not introduce screens than to set limits or take it away later in life. Instead of focusing only on taking screens away, parents can help children discover other activities, like reading, creative play, spending time outdoors and connecting as a family.

It’s important to point out that parents should model habits they hope to see by practicing healthy screen use themselves, since children are more likely to follow behaviors they observe at home.

Firstly, implement a no-screen-time rule at least two hours before bedtime. This will help kids avoid bright lights right before bed, promoting deeper sleep. Secondly, avoid screens during mealtime. Mealtime is a great time for the family to sit together and have conversations. There are so many positive studies about what family mealtime does for children’s social development and for their cognitive development.

Read more from Cedars-Sinai Stories and Insights: A Family Guide to Teens, Screens and Social Media